The total amount you will pay is easy to calculate. You simply multiply the rent you are paying by the amount of months you will stay there according to the rental agreement.
Note* there might be a minor difference in the exact total amount if you are moving in or moving out other dates than the first or last day of each month.
E.g.
You move in to a property 1st of January and will stay during 12 months, paying 10,000 SEK/month.
Total amount will be: 12 x 10,000 SEK = 120,000 SEK.